CAZAC (Constant Amplitude Zero Auto-Correlation) sequences are important in waveform design because of their optimal transmission efficiency and tight time localization properties. Certain classes of CAZAC sequences have been used in radar processing for many years, while recently discovered sequences invite further study. This paper compares different classes of CAZAC sequences with respect to...

This paper deal with the symbol timing issue of an OFDM system in fast varying channel. Symbol timing offset (STO) estimation is a major task in OFDM. Most of existing methods for estimating STO used cyclic prefix or training sequences. In this paper, we consider a new system for STO estimation using constant amplitude zero auto-correlation (CAZAC) sequences as pilot sequences in conjunction wi...

To increase the throughput of transmission systems, MIMO-OFDM technology allows for a better reach and rate of transmission and improves the reception. The synchronization between the transmitter and the receiver has become a big challenge. A bad timing synchronization causes the loss of a lot of information in a MIMO-OFDM system. In this paper, we propose a novel compact preamble structure bas...

A key role for the present wireless communications play families of signals with ideal periodic autocorrelation known as Constant Amplitude Zero Autocorrelation Code (CAZAC) sequences. They find many applications for synchronization, channel estimation, elimination of the negative effects, caused by the multipath spread of the electromagnetic waves, data protection and others. With regard in th...

In NR-based Access to Unlicensed Spectrum (NR-U) of 5G system, satisfy the rules Occupied Channel Bandwidth (OCB) unlicensed spectrum, channels PRACH and PUCCH have use some sequence repetition mechanisms in frequency domain. These will cause serious cubic metric(CM) problems for these channels, although two types are composed Constant Amplitude Zero Auto-correlation(CAZAC) sequences.. Based on...

In multiple target tracking with radar, weak target measurements are often hard to observe due to masking by sidelobes of measurements from stronger targets. The result is lost tracks and deteriorated joint tracking performance. In this work, we design configurable waveforms and adjust the positioning of their ambiguity function (AF) sidelobes to unmask weak targets and improve tracking perform...

Low autocorrelation signals have fundamental applications in radar and communications. We construct constant amplitude zero autocorrelation (CAZAC) sequences x on the integers Z by means of Hadamard matrices. We then generalize this approach to construct unimodular sequences x on Z whose autocorrelations Ax are building blocks for all functions on Z. As such, algebraic relations between Ax and ...

In this paper, we propose a preamble structure and appropriate acquisition algorithms for the uplink cable modem. The proposed preamble consists of a serial concatenation of identical constant amplitude zero autocorrelation (CAZAC) sequences. The proposed preamble is used for the frame detection, coarse symbol timing and carrier frequency recovery for the uplink cable modem compliant to data-ov...